Inexpensive one-way screen.
Emily Barton · BMJ · 1972
mean level of serum vitamin B12 among smokers is significantly less than among non-smokers.They discuss various factors which may have affected the serum B12 level, but they do not mention folate deficiency, which is common during pregnancy.Low serum Bi2 levels have been observed in over 40% of patients with megaloblastic anaemia due to folate deficiency, and the levels rise slowly to within the normal range on treatment with folic acid alone.1 2 As Dr. McGarry and Miss Andrews have not published the serum folate levels in their group of pregnant women, it is not possible to draw conclusions from the B12 levels unless all the women were taking folic acid.-I am, etc.,